Method of constructing girders and ceilings



Oct. l1, 1949.V w. R. MATHls METHOD OF CONSTRUCTING GIRDERS AND CEILINGSFile@ oct. 16, 1947 3 Sheets-Sheet 2 'I'. 'lill/f l FIG. e.

Oct. 1l, 1949. w,-R, MAN-|15 2,484,520

METHOIJ OF CONSTRUGTING 'GIRDERS AND CEILINGS I Filed OCT.. 16, 1947 3Sheets-Sheet 3 INVENTOR.

k u u William R. lvl-@11115 BY M W ATTORNEYS. l

Patented oct. 11, 1949 l METHOD oF coNsTRUoTNG GIRDERS AND CEILINGSWilliam R. Mathis, Tampa,` Fla.

original application December 5, 1942, serial No. 467,971. Divided kandthis application October 16, 1947, serial No. 780,273

2 Claims. (ci. 254155) This invention relates to the construction ofgirders and ceilings of reinforced concrete and `more particularly tothe method of producing samel The present application is a division of aparent application 4filed by me Decembei,v 1942,

Serial No. 467,971, disclosing molding apparatus yfor forming buildings,which has since matured in Patent No. 2,434,708 on January 20, 1948,wherein is disclosed and claimed apparatus for Amolding girders and formolding them integral with `the walls of buildings. The apparatus thusvdisclosed is suitable for use in carrying out the present method, althothe method is not limited touse of such specific apparatus.

The principal object of thewinvention is to provide a method whereby theceilings are molded after the girders have been shaped and the concretehas set, with suitable reinforcement carried thereby to tie the ceilingto the girders, and to utilize sectional columns in the support of thegirder and ceiling forms, portions of the sectional columns beingretained in place thruout steps in the method,l or from the time thegirder molds are in readiness to receive the concrete, until the ceilingmaterial has been placed-andyl has become set. .A l 'f p Other objectsand advantages of the invention will appear in the following detaileddescription, taken in connection with the accompanying drawing, forminga part of this specification, and in which drawing- Fig. 1 is afragmentary view partly in Vertical section and partly in elevationshowing a wall portion and a girder form in place, suitable for carryingout one of the steps of the method.

Fig. 2 is an enlarged sectional view on substantially the line 2 2 ofFig. 1.

Fig. 3 is a sectional view on substantially the line 3-3 of Fig. 2.

Fig. 4 is a view partly in vertical section and partly in elevationshowing the completion of a girder and the removal of the moldtherefrom.

Fig. 5 is a similar view showing a ceiling form in relationship to thegirder.

Fig. 6 is a similar view showing the ceiling in place, spanning thedistance between two girders.

Fig. 7 is a fragmentary perspective View of sections of a suitablecolumn which may be used in supporting girder mold.

Fig. 8 is a perspective view of a column section which may be used insupporting a ceiling form.

In carrying out the present method, suitable spaced girder molds 85 areprovided, which carry body reinforcement members 401, 433 and 434 themajor sections 345. 'supported on any suitable base or footing 60.

and portions of ceiling reinforcement 418; This assembly Vis supportedby sectional columns 88 comprising major sections 345 and minor sections346 and 440 which are interchangeable on The columns 88 areAfterce'rnentitious material is poured in the molds 55, girders 4M areformed having portions ofthe reinforcement 4| B extending from the-lowerlportions thereof. To this reinforcement `4i8 isadded suitableadditional ceiling reinforcement43'l; spanning the distance between thegirders 4l4 and thereafter a `suitable ceiling form 422 is provided,supported Aby the sectional columns 88. Whil'ethe girder molds aresupported by the columns, each column 88 comprises the majorlsection 345and the minor section 346,

vand while the ceiling form is being supported by the columns 88, eachcolumn comprises the maior section 345 and the minor section 440.

."Theicementitiousmateral to form the ceiling may be'po'ured upon theceiling form thru the .space between the girders 4`l4 and surrounds theceiling reinforcement 4 l 3V and 43].

' While the mold 85 may be of any suitabletype,

'in 'thel example shown, it'comprises spaced side Jangletmembers 425,upper channel members 425,

and lower channel members 421. The angle members 425 are arranged withtheir webs confronting one another and their flanges outstanding fromthe webs. The upper channel members 426 are similarly arranged, the webssupporting the reinforcement 433', in the nature of bridge barsextending between the webs of upper channel members 426. The lowerchannel members 421 are arranged with their webs uppermost and theirflanges extending downwardly therefrom. These lower channel members arespaced apart so as to provide a slot 429 between the confronting flanges429a thereof, for the reception of the ceiling reinforcement 4|8, ashereinafter described. The other or outer flanges 429b are preferablydeeper and cooperate with the minor sections 346 of the columns 88, asmay be observed in Fig. 2.

The reinforcement 401 is shown as of the rod type, extendinglongitudinally of the mold 85, and is supported by reinforcement 434 inthe nature of suspending wires connected to the bridge bars 433. Thesesuspending wires are also connected to the reinforcement 4l8 as shown inFig. 2.

The reinforcement 418 is preferably in the form of a metallic striplocated to extend 1ongitudinally of the mold 85, and thru the slot 429so that its lower portion is exposed below the 3 mold. rIhis lowerexposed portion is preferably provided with transverse holes 438 tofacilitate attachment of the reinforcement 43'! thereto. Thereinforcement 458 may also comprise cross bars 438 along the upperportion of the bar which become embedded in the concrete.

The sectional columns 88 preferably have the upper portion of each majorsection 345 beveled as at 485 and the lower portions of each minorsection 346 is accordingly beveled as at 404 at a corresponding angle.These two sections may be connected together with the beveled portionsin engagement by plates 399 bolted or otherwise detachably connectedthereto. The upper end of the minor section 343 may abut against thelower edges of the flanges 4291), as shown in Fig. 2, and the minorsections 348 may be temporarily secured to the flanges 425ib by plates480 by bolts or other detachable connections.

It may be observed that, from this arrangement, upon detachment of theplates 399 and 408, the column section 346 may be eased away from themold 85, after the girder material has set, and the mold removed,leaving a portion of the reinforcement 4 I8 exposed beneath each girder,whereupon the reinforcement 431 may be placed extending thru the holes438 as previously described.

This may be followed by the placing of the ceiling form 442, supportedby the major sections 345 of the columns 88 and the minor sections 440which, in the example shown have their lower portions beveled as at44!)a to correspond with the bevel 405 of the major sections 345,detachably secured thereto by the plates 339.

After the ceiling material becomes set, the i' forms 442 may be removed,the minor sections 440 eased away from the ceiling, after removing theplates 339, and the major sections of the columns 88 removed from theirfootings.

The method greatly facilitates the construction of girders and ceilingssince the girders may lrst be formed without interference with floor orceiling forms. The columns 88 temporarily used in the support of moldsand forms may be accurately placed and the major portions of these`columns serve to progressively support the molds and forms, thruout theconstruction of the girders and ceilings.

I claim:

1. In a method of constructing grders and ceilings, those steps whichconsist in supporting spaced girder molds comprising removable formsproviding a hollow for receiving cementitious material, and ceilingreinforcement extending below the hollow of the mold, by sectionalcolumns; ,pouring .cementitious material into the molds to form thegirders; removing the girder forms and the upper sections of the columnswhen the cementitious material has set; supporting additionalreinforcement by said ceiling reinforcement and spanning the distancebetween the girders; supporting a ceiling form spaced beneath Asaidreinforcement, on the remaining portions of 'the columns; pouringcementitious material from above and between the girders, upon saidceiling form; and removing the ceiling form and the remaining portionsof the columns after the ceiling cementitious material has set.

2. I-n a methodof constructing girders and ceilings, those steps which-consist in supporting spaced girder molds by sectional columns; pouringcementitious material into the molds to form the girders; removing thegirder forms and the upper sections of the columns when the cementitiousmaterial has set; support-ing ceiling reinforcement from the girdersthus formed, spanning the distance between the girders; supporting aceiling form spaced beneath said reinforcement, on the remainingportions of the columns; pouring cementitious material from above andbetween the girders, upon said ceiling form; and removing the ceilingform and the remaining portions of the columns after the ceilingcementitious material has set.

WILLIAM R. MATHIS.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 962,295 Arnn June 21, 19101,630,794 Keller May 31, 1927 1,796,851 Macomber Mar. 17, 1931

